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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A260506 Number of signed permutations of length n that are sortable to the identity permutation by some sequence of cdr (context-directed reversal) and cds (context-directed swap) moves.

Table of values

n a(n)
1 1
2 3
3 18
4 140
5 1384
6 16428
7 228248

List of values

[1, 3, 18, 140, 1384, 16428, 228248]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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